1. Set the operation mode to 1 out of 3.
2. Inject a phase current into the IED with an initial value below the set value of
IP>> and also make sure that the set value IP>> is in between IP>>Min and
IP>>Max.
3. Increase the injected current in the Ln phase until the TR_A (TR_B or TR_C)
signal appears.
4. Switch the fault current off.
Observe: Do not exceed the maximum permitted overloading of
the current circuits in the IED.
5. Compare the measured operating current with the set value.
6. Set the operation mode to 2 out of 3 and inject current into one of the phases and
then check that no TRLn signal appears.
13.5.1.2 Completing the test
M11754-24 v5
Continue to test another function or end the test by changing the TESTMODE setting to
Disabled. Restore connections and settings to their original values, if they were
changed for testing purposes.
13.5.2 Directional phase overcurrent protection, four steps
OC4PTOC (51_67)
SEMOD56287-67 v9
Prepare the IED for verification of settings outlined in Section
"Preparing the IED to
verify settings".
Values of the logical signals for OC4PTOC are available on the local HMI under Main
menu/Tests/Function status/Current protection/
PhaseOverCurrent4Step(51_67,4(3I>))/OC4PTOC(51_67;4(3I>)):x, where x =
instance number.
The Signal Monitoring in PCM600 shows the same signals that are available on the
local HMI.
13.5.2.1 Verifying the settings
SEMOD56287-72 v10
The verification of the non-directional phase overcurrent function is
done as instructed below, but without applying any polarizing voltage.
Section 13 1MRK 502 073-UUS A
Testing functionality by secondary injection
188 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
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